The Cuniculidae (Agoutidae) has been included in Dasyproctidae by several authors, but see comments under Cuniculidae. McKenna and Bell (1997) included the dasyproctids as a subfamily (Dasyproctinae) within the Agoutidae. Molecular data (Rowe and Honeycutt, 2002) strongly support designation of two separate families: the Dasyproctidae and the Cunniculidae (Agoutidae). Placed in the superfamily Cavioidea by Woods (1982) and McKenna and Bell (1997).